Welleria-Dizygopleura Community, Tonoloway Formation: Pridoli, Maryland

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Pintopsis sp.
Algae
Algae indet.
calcareous algae; seen in thin section
Gastropoda
Gastropoda indet. Cuvier 1795
seen in thin sectionqq
Gastropoda - Murchisoniina - Loxonematidae
Loxonema sp. Phillips 1841
Gastropoda - Murchisoniina - Hormotomidae
Hormotoma sp. (Salter 1859)
Tentaculitida
Tentaculitida indet. Ljaschenko 1955
seen in thin section
Tentaculitida - Tentaculitidae
Tentaculites sp. von Schlotheim 1820
unclassified
Brachiopoda indet. Cuvier 1805
seen in thin section
Rhynchonellata - Rhynchonellida - Camarotoechiidae
Camarotoechia sp. Hall and Clarke 1893
genus name in quotes
Rhynchonellata - Athyridida - Meristellidae
Hindella sp. Davidson 1882
Rhynchonellata - Athyridida - Rhynchospirinidae
Rhynchospira sp. Hall 1859
replaced by Rhynchospirina
Ostracoda - Leperditellocopida - Aparchitidae
Aparchites sp.
Ostracoda - Leperditicopida - Leperditiidae
Leperditia sp. Rouault 1851
Ostracoda - Platycopida - Kloedenellidae
Dizygopleura sp. Ulrich and Bassler 1923
Ostracoda - Palaeocopida - Beyrichiidae
Welleria sp. Ulrich and Bassler 1923
unclassified
Echinodermata indet. Klein 1754
seen in thin section
see common names

Geography
Country:United States State/province:Maryland
Coordinates: 39.6° North, 78.8° West (view map)
Paleocoordinates:33.3° South, 42.5° West
Basis of coordinate:based on political unit
Geographic resolution:local area
Time
Period:Silurian Epoch:Pridoli
10 m.y. bin:Silurian 2
Key time interval:Pridoli
Age range of interval:423.00000 - 419.20000 m.y. ago
Stratigraphy
Formation:Tonoloway
Stratigraphic resolution:formation
Lithology and environment
Primary lithology: lime mudstone
Secondary lithology: grainstone
Includes fossils?Y
Includes fossils?Y
Lithology description: Boucot (1999-PBDB ref. 6948, p.576) mentions micrites and sparites.
Environment:open shallow subtidal Tectonic setting:foreland basin
Geology comments: "The lower and upper members represent a supratidal-intertidal mudflat..on the other hand the middle member was mainly subtidal...Tonoloway grades westward into Salina evaporites..."
From Boucot (1999): "Warshauer and Smosna (1977) mention that many of the megafossils are broken, pellets abundant, some shells articulated, variably sorted, with both micrites and sparites present. This community sounds like a moderately high energy, normal turbulence level, normally oxygenated, BA 2 unit, situated between the Leperditiid and Zygobeyrichia-Bolbiprimitia Communities. [It] may grade into BA 1 Dizygopleura-Kloedenia Community as evidenced by some ostracodes shared between the two."
Taphonomy
Collection methods and comments
Reason for describing collection:paleoecologic analysis
Metadata
Database number:24914
Authorizer:M. Foote Enterer:M. Foote
Modifier:M. Foote Research group:marine invertebrate
Created:2002-08-22 13:31:07 Last modified:2006-09-15 15:14:05
Access level:the public Released:2002-08-22 13:31:07
Creative Commons license:CC BY
Reference information

Primary reference:
6990. S. M. Warshauer and R. Smosna. 1977. Paleoecologic controls of the ostracode communities in the Tonoloway Limestone (Silurian; Pridoli) of the Central Appalachians. in H. Loffler and D. Danielopol, eds. Aspects of Ecology and Zoogeography of Recent and Fossil Ostracoda. W. Junk, The Hague 475-485 [M. Foote/M. Foote/J. Ju]